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Thread: SwingWorker updating JTABLE ...

  1. #1
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    Default SwingWorker updating JTABLE ...

    Guys,

    I want to update the JTABLE with contents of database using swing worker . I have a code below,but it doesnt show the data in table ?
    There are no errors, please help me with rewriting the code.
    snapshot included..1.jpg

     
    import java.awt.BorderLayout;
    import java.awt.EventQueue;
    import java.awt.GridLayout;
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.ResultSetMetaData;
    import java.sql.Statement;
    import java.util.Vector;
    import java.util.concurrent.ExecutionException;
     
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.SwingWorker;
    import javax.swing.table.DefaultTableModel;
    import javax.swing.table.TableModel;
     
    public class Ser 
    { 
    	   static JTable table =  new JTable();
    	   public static void main(String[] args) throws Exception {
    	        EventQueue.invokeLater(new Runnable() {
    	            @Override
    	            public void run() 
    	            {
    	                init();
    	            }
    	        });
    	    }
     
    	   private static void init() {
    		   execTask();
    		   JFrame frame = new JFrame("Random Data Demo");
    	        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    	        frame.setSize(600,600);
     
    	    	DefaultTableModel model = new DefaultTableModel();
    	    	//JTable table =  new JTable(model);
    	    	table.setModel(model);
    	    	JScrollPane scrollPane = new JScrollPane(table);
     
    	    	JPanel panel = new JPanel(new BorderLayout());
    	    	//Swingworker mainWorker = new Swingworker(table);
               // mainWorker.execute();
     
    	    	panel.add(table.getTableHeader(), BorderLayout.PAGE_START);
    	    	panel.add(scrollPane, BorderLayout.CENTER);
    	    	//getContentPane().add(panel);
     
    	        frame.setVisible(true);
    	    }
     
    	   private static void execTask() {	  
    		   Swingworke mainWorker = new Swingworke(table);
    		   mainWorker.execute(); 
     
          }
    }
     
    class Swingworke extends SwingWorker<TableModel, TableModel> {
     
        private final JTable table;
     
        public Swingworke(JTable table) {
            this.table = table;
        }    
        @Override
        protected TableModel doInBackground() throws Exception {
            Vector data = new Vector();
            Vector columns = new Vector();
            PreparedStatement ps = null;
            ResultSet rs = null;
            try {              	
            	Class.forName("com.mysql.jdbc.Driver").newInstance();
                Connection con = DriverManager.getConnection("jdbc:mysql://localhost/moxa?zeroDateTimeBehavior=convertToNull", "root", "root");
                String sql = "Select * from alarmval1";
                Statement statement = con.createStatement();
                ResultSet resultSet = statement.executeQuery(sql);
                ResultSetMetaData metaData = resultSet.getMetaData();
                int columnCount = metaData.getColumnCount();
                //store column names  
                for (int i = 1; i <= columnCount; i++) {
                    columns.add(metaData.getColumnName(i));
                }
     
                columns.ensureCapacity(columnCount);
     
                Vector row;
                while (resultSet.next()) {
     
                    row = new Vector(columnCount);
                    for (int i = 1; i <= columnCount; i++) {
                        row.add(resultSet.getString(i));
                        System.out.println(resultSet.getString(i));
                    }
                    data.add(row);
     
                    //Debugging                
                }
     
                // List.setModel(tableModel);
     
            } finally {
                try {
                    ps.close();
                } catch (Exception e) {
                }
                try {
                    rs.close();
                } catch (Exception e) {
                }
            }
     
            DefaultTableModel tableModel = new DefaultTableModel(data, columns);
            return tableModel;
        }
     
        @Override
        protected void done() {
            try {
                TableModel model = get();
                table.setModel(model);
            } catch (InterruptedException | ExecutionException ex) {
                ex.printStackTrace();
            }
        }
    }

    Thanks...
    Last edited by harshilshah; April 30th, 2013 at 06:38 AM. Reason: change of code..


  2. #2
    Super Moderator jps's Avatar
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    Default Re: SwingWorker updating JTABLE ...

    Try to follow the flow of the program by using println to log what is happening. Try to determine where things do not happen as you expect. Include as many details with your question as you can.

    "but it doesnt show the data in table ?" ...is not really a great question about the problem you have.

  3. #3
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    Default Re: SwingWorker updating JTABLE ...

    Quote Originally Posted by jps View Post
    Try to follow the flow of the program by using println to log what is happening. Try to determine where things do not happen as you expect. Include as many details with your question as you can.

    "but it doesnt show the data in table ?" ...is not really a great question about the problem you have.
    FOUND THE SOLUTION ....

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